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____ [38]
3 years ago
15

12. An electrolysis reaction is

Chemistry
1 answer:
tia_tia [17]3 years ago
6 0

Answer: D.) non-spontaneous.

Explanation:

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What is the mass of aluminum metal that releases 22.4 l of hydrogen gas at stp from hydrochloric acid? __al(s) + __hcl(aq) → __a
Keith_Richards [23]
The mass  of  Al  metal   that releases 2.4 L  of hydrogen gas at STP  is calculated as below

AT  STP  1 mole  =22.4 l
what about 22.4l =? moles
(22.4 L x 1  mole) /22.4 L= 2mole

write the reacing reaction

2Al+ 6 HCL = 2AlCl3 + 3H2
by use of  mole ratio between  Al to  H2  which is 2 : 3  the   mole Al = 1 x2/3 = 0.667 moles
mass =moles x molar mass
=0.667 mole  x27 g/mol= 18  grams
3 0
4 years ago
Preparation of Standard Buffer for Calibration of a pH Meter The glass electrode used in commercial pH meters gives an electrica
lana66690 [7]

Answer:

  • Mass of NaH₂PO₄·H₂O = 8.542 g
  • Mass of Na₂HPO₄ = 5.410 g

Explanation:

Keeping in mind the equilibrium:

H₂PO₄⁻ ↔ HPO₄⁻² + H⁺

We use the Henderson-Hasselbalch equation (H-H):

pH = pka + log\frac{[A^{-}]}{[HA]}

For this problem [A⁻] = [HPO₄⁻²] and [HA] = [H₂PO₄⁻]

From literature we know that pka = 7.21, from the problem we know that pH=7.00 and that

[HPO₄⁻²] + [H₂PO₄⁻] = 0.100 M

From this equation we can <u>express [H₂PO₄⁻] in terms of [HPO₄⁻²]</u>:

[H₂PO₄⁻] = 0.100 M - [HPO₄⁻²]

And then replace [H₂PO₄⁻] in the H-H equation, <u>in order to calculate [HPO₄⁻²]</u>:

7.00=7.21+log\frac{[HPO4^{-2}] }{0.100 M-[HPO4^{-2}]} \\-0.21=log\frac{[HPO4^{-2}] }{0.100 M-[HPO4^{-2}]}\\10^{-0.21} =\frac{[HPO4^{-2}] }{0.100 M-[HPO4^{-2}]}\\0.616*(0.100M-[HPO4^{-2}])=[HPO4^{-2}]\\0.0616 M = 1.616*[HPO4^{-2}]\\0.03812 M =[HPO4^{-2}]

With the value of  [H₂PO₄⁻],<u> we calculate [HPO₄⁻²]</u>:

[HPO₄⁻²] + 0.0381 M = 0.100 M

[HPO₄⁻²] = 0.0619 M

Finally, using the concentrations, the volume, and the molecular weights; we can calculate the weight of each substance:

  • Mass of NaH₂PO₄·H₂O = 0.0619 M * 1 L * 138 g/mol = 8.542 g
  • Mass of Na₂HPO₄ = 0.0381 M * 1 L * 142 g/mol = 5.410 g

8 0
4 years ago
3.
KatRina [158]

Answer A,They can form a triple covalent bond.

Explanation:

7 0
3 years ago
You are performing an
koban [17]

Answer:

4.6 moles MgO

Explanation:

number of moles is equals to the mass in grams divided by RFM

RFM=16+24.3=40.3

187/40.3

=4.6 moles of MgO

3 0
4 years ago
Which of Earth's spheres consists of all living things? (1 point)
vodka [1.7K]

Answer:

atmosphere

Explanation:

because oxygen is retained in the atmosphere

3 0
3 years ago
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